Genetic Diversity and Structure of Latvian Trifolium fragiferum Populations, a Crop Wild Relative Legume Species, in the Context of the Baltic Sea Region

The aim of the present study was to investigate the genetic diversity and structure of eight Trifolium fragiferum populations in Latvia in the context of the Baltic Sea region. In addition, one wild population from Estonia and one from Denmark were analyzed, as well as the commercial cultivar 'Palestine'. The genetic diversity of wild populations was low, compared to the higher diversity in the cultivar 'Palestine'. The wild populations were differentiated into four clusters, separate from the cultivar 'Palestine'. Three of the genetically similar Latvian populations were also geographically proximal, but the four populations geographically located near the capital, Riga, were genetically differentiated from each other. The genetic results were compared to previously published physiological studies of the same populations. The results from this study can be used as a basis for further studies of T. fragiferum populations in the Baltic Sea region, and to develop in situ and ex situ conservation strategies for this crop wild relative species.